1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Force feedback support for GreenAsia (Product ID 0x12) based devices
4 *
5 *  The devices are distributed under various names and the same USB device ID
6 *  can be used in many game controllers.
7 *
8 *  0e8f:0012 "GreenAsia Inc.    USB Joystick     "
9 *   - tested with MANTA Warior MM816 and SpeedLink Strike2 SL-6635.
10 *
11 *  Copyright (c) 2008 Lukasz Lubojanski <lukasz@lubojanski.info>
12 */
13
14/*
15 */
16
17#include <linux/input.h>
18#include <linux/slab.h>
19#include <linux/hid.h>
20#include <linux/module.h>
21#include "hid-ids.h"
22
23#ifdef CONFIG_GREENASIA_FF
24
25struct gaff_device {
26	struct hid_report *report;
27};
28
29static int hid_gaff_play(struct input_dev *dev, void *data,
30			 struct ff_effect *effect)
31{
32	struct hid_device *hid = input_get_drvdata(dev);
33	struct gaff_device *gaff = data;
34	int left, right;
35
36	left = effect->u.rumble.strong_magnitude;
37	right = effect->u.rumble.weak_magnitude;
38
39	dbg_hid("called with 0x%04x 0x%04x", left, right);
40
41	left = left * 0xfe / 0xffff;
42	right = right * 0xfe / 0xffff;
43
44	gaff->report->field[0]->value[0] = 0x51;
45	gaff->report->field[0]->value[1] = 0x0;
46	gaff->report->field[0]->value[2] = right;
47	gaff->report->field[0]->value[3] = 0;
48	gaff->report->field[0]->value[4] = left;
49	gaff->report->field[0]->value[5] = 0;
50	dbg_hid("running with 0x%02x 0x%02x", left, right);
51	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
52
53	gaff->report->field[0]->value[0] = 0xfa;
54	gaff->report->field[0]->value[1] = 0xfe;
55	gaff->report->field[0]->value[2] = 0x0;
56	gaff->report->field[0]->value[4] = 0x0;
57
58	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
59
60	return 0;
61}
62
63static int gaff_init(struct hid_device *hid)
64{
65	struct gaff_device *gaff;
66	struct hid_report *report;
67	struct hid_input *hidinput;
68	struct list_head *report_list =
69			&hid->report_enum[HID_OUTPUT_REPORT].report_list;
70	struct list_head *report_ptr = report_list;
71	struct input_dev *dev;
72	int error;
73
74	if (list_empty(&hid->inputs)) {
75		hid_err(hid, "no inputs found\n");
76		return -ENODEV;
77	}
78	hidinput = list_entry(hid->inputs.next, struct hid_input, list);
79	dev = hidinput->input;
80
81	if (list_empty(report_list)) {
82		hid_err(hid, "no output reports found\n");
83		return -ENODEV;
84	}
85
86	report_ptr = report_ptr->next;
87
88	report = list_entry(report_ptr, struct hid_report, list);
89	if (report->maxfield < 1) {
90		hid_err(hid, "no fields in the report\n");
91		return -ENODEV;
92	}
93
94	if (report->field[0]->report_count < 6) {
95		hid_err(hid, "not enough values in the field\n");
96		return -ENODEV;
97	}
98
99	gaff = kzalloc(sizeof(struct gaff_device), GFP_KERNEL);
100	if (!gaff)
101		return -ENOMEM;
102
103	set_bit(FF_RUMBLE, dev->ffbit);
104
105	error = input_ff_create_memless(dev, gaff, hid_gaff_play);
106	if (error) {
107		kfree(gaff);
108		return error;
109	}
110
111	gaff->report = report;
112	gaff->report->field[0]->value[0] = 0x51;
113	gaff->report->field[0]->value[1] = 0x00;
114	gaff->report->field[0]->value[2] = 0x00;
115	gaff->report->field[0]->value[3] = 0x00;
116	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
117
118	gaff->report->field[0]->value[0] = 0xfa;
119	gaff->report->field[0]->value[1] = 0xfe;
120
121	hid_hw_request(hid, gaff->report, HID_REQ_SET_REPORT);
122
123	hid_info(hid, "Force Feedback for GreenAsia 0x12 devices by Lukasz Lubojanski <lukasz@lubojanski.info>\n");
124
125	return 0;
126}
127#else
128static inline int gaff_init(struct hid_device *hdev)
129{
130	return 0;
131}
132#endif
133
134static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id)
135{
136	int ret;
137
138	dev_dbg(&hdev->dev, "Greenasia HID hardware probe...");
139
140	ret = hid_parse(hdev);
141	if (ret) {
142		hid_err(hdev, "parse failed\n");
143		goto err;
144	}
145
146	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
147	if (ret) {
148		hid_err(hdev, "hw start failed\n");
149		goto err;
150	}
151
152	gaff_init(hdev);
153
154	return 0;
155err:
156	return ret;
157}
158
159static const struct hid_device_id ga_devices[] = {
160	{ HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012),  },
161	{ }
162};
163MODULE_DEVICE_TABLE(hid, ga_devices);
164
165static struct hid_driver ga_driver = {
166	.name = "greenasia",
167	.id_table = ga_devices,
168	.probe = ga_probe,
169};
170module_hid_driver(ga_driver);
171
172MODULE_LICENSE("GPL");
173